Schreiber Chillers MC75WC - Manual (Page 6)

MC75 - WC
2. Installation
1.2 Installation, Operation
and Maintenance
Instructions.
1.3 Model NPE/NPE-F
DESCRIPTION & SPECIFICATIONS:
The models NPE (close-coupled) and NPE-F (frame-
mounted) are end suction, single stage centrifugal pumps
for general liquid transfer service, booster applications,
etc. Liquid-end construction is all AISI Type 304 stainless
steel, stamped and welded. Impellers are fully enclosed,
non-trimable to immediate diameters. Casings are fitted
with a diffuser for efficiency and for negligible radial shaft
loading.
Close-coupled units have NEMA 48J or 56J
motors with C-face mounting and threaded shaft
extension. Frame-mounted units can be coupled to
motors through a spacer coupling, or belt driven.
1.1. Inspect unit for damage. Report any damage to
carrier/dealer immediately.
1.2. Electrical supply must be a separate branch circuit
with fuses or circuit breakers, wire sizes, etc., per National
and local electrical codes. Install an all-leg disconnect
switch near pump.
1.3.1 CAUTION
Always disconnect electrical power when handling
pump of controls.
1.3. Motors must be wired for proper voltage. Motor wiring
diagram is on motor nameplate. Wire size must limit
maximum voltage drop to 10% of nameplate voltage at
motor terminals, or motor life and pump performance will
be lowered.
1.4. Always use horsepower-rated switches, contactor
and starters.
1.5. Motor Protection
1.5.1. Single-phase: Thermal protection for
single-phase units is sometimes built in (check
nameplate). If no built-in protection is provided,
use a contactor with a proper overload. Fusing
is permissible.
1.5.2. Three-phase: Provide three-leg protection
with properly sized magnetic starter and thermal
overloads.
1.6. Maximum Operating Limits:
Liquid Temperature: 212F (100C) with standard seal.
250F (120C) with optional high
2.1. General
2.1.1. Locate pump as near liquid source as
possible (below level of liquid for automatic
operation).
2.1.2. Protect from freezing or flooding.
2.1.3. Allow adequate space for servicing and
ventilation.
2.1.4. All piping must be supported
independently of the pump, and must “line-up”
naturally.
1.1.1 CAUTION
Never draw piping into place by forcing the pump
suction and discharge connections.
2.1.5. Avoid unnecessary fittings. Select sizes to
keep friction losses to a minimum.
2.2. Close-Coupled Units:
2.2.1. Units may be installed horizontally,
inclined or vertically.
1.1.2 CAUTION
Do not install with motor below p ump. Any leakage or
condensation will affect the motor.
2.2.2. Foundation must be flat and substantial to eliminate
strain when tightening bolts. Use rubber mounts to
minimize noise and vibration.
2.2.3. Tighten motor hold-down bolts before connecting
piping to pump.
2.3. Frame-Mounted Units:
2.3.1. Bedplate must be grouted to a foundation with
solid footing. Refer to Fig. 1.
1. Important